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<p class="p1"><span class="s1">B</span><span class="s2">Y </span>Joëlle Coutaz, James L. Crowley, Simon Dobson, <span class="s2">AND </span>David Garlan</p>
<p class="p2"><i>Context is not simply the state of a predefined environment with a fixed set of interaction resources. It’s part of a process of interacting with an ever-changing environment composed of reconfigurable, migratory, distributed, and multiscale resources.</i></p>
<p class="p3">CONTEXT <span class="s3"><i>is </i></span>KEY</p>
<p class="p4">Figure 1. In the Olympic café, Bob and Jane use the objects on the table to illustrate their ideas for the layout of the city they are planning together.</p>
<p class="p5"><span class="s4">S</span>ince the early 1960s, the notion of context has been modeled and exploited in many areas of informatics. The scientific community has debated definitions and uses for many years without reaching clear consensus [4].</p>
<p class="p5">Nonetheless, it is commonly agreed that context is about evolving, structured, and shared information spaces, and that such spaces are designed to serve a particular purpose. In ubiquitous computing, the purpose is to amplify human activities with new services that can adapt to the circum- stances in which they are used.</p>
<p class="p6">COMMUNICATIONS OF THE ACM March 2005/Vol. 48, No. 3<span class="Apple-tab-span">	</span><span class="s5">49</span></p>
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